day18:MD5加密

shy-coder · shy-coder · commit 286d5bcbd92c · 2020-11-06T23:31:26.000+08:00
diff --git a/src/main/java/com/shy/day18/MD5test.java b/src/main/java/com/shy/day18/MD5test.java
@@ -0,0 +1,42 @@
+package com.shy.day18;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * @ClassName MD5test
+ * @Author shy
+ * @Date 2020/11/6
+ **/
+public class MD5test {
+    public static void main(String[] args) {
+        String str = "qwer12345";
+        System.out.println("加密前的密码：" + str);
+        String md5Str = createMD5(str);
+        System.out.println("加密后的密码:" + md5Str);
+    }
+    /**
+     * 创建给定字符串对应的加密后的字符串
+     */
+    public static String createMD5(String str) {
+        str = str + "shy";
+        try {
+            MessageDigest md = MessageDigest.getInstance("MD5");
+            md.update(str.getBytes());
+            byte[] b = md.digest();
+
+            int temp;
+            StringBuilder sb = new StringBuilder("");
+            for (byte b1 : b) {
+                temp = b1;
+                if (temp < 0) temp += 256;
+                if (temp < 16) sb.append("0");
+                sb.append(Integer.toHexString(temp));
+            }
+            str = sb.toString();
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+        return str;
+    }
+}
